Device for preventing sliding parts from rotating



May l 1951 P. G. J. M. AUDEMAR 2,551,410

DEVICE FOR PREVENTING SLIDING PARTS FROM ROTATING Filed NOV. lO, 1947 fw/w Y Patented May 1, 1951 UNITE STATES Fri'ltlbi tfFlCE DEVCE FOR PREVENTING SLIDING PARTS FROM ROTATING Pierre Guillaume Joseph Marie Audemar, Villennes-sur-Seine, France Section 1, Public Law 690, August 8, 1946 Patent expires .lune 24, 1962 2 Claims.

This invention relates to mounting arrange ments for a member sliding on a xed part of a machine, and in particular, but not exclusively, to mounting arrangements for wheels on the legs of landing gears for aeroplanes.

The object of the present invention, while permitting free sliding of the movable member with respect to the xed part, is strictly to prevent any relative rotational movement of said member about its sliding axis.

Devices of this kind are already known which consist of two helical springs wound in an opposite direction and secured to the iiXed part at one end and to the movable part at the other end. Where the various turns of the two springs cross one another they are pivotally connected by pins, in order to resist the torque and to ensure the necessary mechanical strength of the assembly.

The device according to the invention, which is much simpler and aords a greater mechanical strength than the known devices, is constituted by a sleeve of metallic fabric made of resilient crossed wires or the like, each wire or the like bei ing secured at one end to the sliding member and at the other end to the nxed part, which sleeve capable of deformations in the axial direction but resists to sional stresses.

A preferred embodiment of the present invention will be hereinafter described, by way of example only, lwith reference to the accompanyn ing drawing, the single gure of which is a diagrammatic elevational view of an embodiment of the device supposed to be applied to the suspension of an aeroplane.

The drawing shows a landing gear strut includw ing a fixed part In, that is to say a part directly carried by the body of the aeroplane, and a slid-- ing part I mounted on the fork 3 in which wheel is mounted. The problem is, while permitting vertical sliding displacement of the part I, to prevent said part from turning about the longitudinal axis common to both parts I and Ia, that is to say to keep the wheel 2 in a iixed vertical plane with respect to the body or" the aertuolazwev According to the invention, there is provided, between part la of the strut and part I, or what is equivalent to this, between part la and fork a structure constituted by a metallic network of crossed wires '-l and 4a, such a network being capable of deforming in the sliding direction or" the strut but resisting any torsional stress applied thereto.

As shown in the drawing, each metal wire, for instance fl, passes alternately over and under the wires @la that it crosses. This interweaving of the wires prevents any torsional deformation of the whole and keeps wheel 2 in a Xed plane with respect to the body of the aeroplane.

It will be understood that the invention is not limited to the particular application described and shown, for many other applications may be contemplated without departing from the spirit of the invention as delined by the accompanying claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

i. A device for mounting a longitudinal mem ber in slidable relation to a Xed part and in the direction of its longitudinal axis while preventing said member from carrying out rotational movement about said axis; comprising a sleeve of inet-allie mesh made oi resilient crossed wires, each wire passing alternately over and under the wire that it crosses, one end of said sleeve being secured to said member and the opposite end of said sleeve being connected to said Xed part, said sleeve being capable of deformations in the direction of said longitudinal axis but resisting torsional stresses.

2. Landing gear for aircraft, comprising a wheel carrying leg slidable in a xed part connected to the aircraft body, and a sleeve 0I metallic fabric made of resilient crossed wires, each wire of said fabric passing alternatively over and under the wires that it crosses and being secured at one end to said wheel carrying leg and at the other end to said xed part, said sleeve being capable of deformations in the axial direction but resisting torsional stresses.

PIERRE GUILLAUNEE JOSEPH MARIE AUDEMAR.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,290,549 Harden Jan. 7, 1919 1,349,079 Markham Aug. l0, 1920 2,212,922 Mercier Aug. 27, 1940 2,367,467 Mercier Jan. 16,1945 2,367,944 Ingalls Jan. 23, 1945 

